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CVE-2026-64007 is a Linux kernel netfilter synproxy flaw caused by using a stale tcphdr pointer after a call to skb_ensure_writable() in TCP timestamp adjustment logic. In the affected path, the IPv4 and IPv6 synproxy hooks obtain a TCP header pointer with skb_header_pointer() and pass it into synproxy_tstamp_adjust(). That pointer may reference either the packet buffer head directly or a temporary stack copy. synproxy_tstamp_adjust() then calls skb_ensure_writable(skb, optend). On cloned or non-linear sk_buffs, this can trigger pskb_expand_head(), which reallocates packet storage and frees the old skb head. The cached tcphdr pointer is therefore no longer valid, but it is later reused by inet_proto_csum_replace4() to update the TCP checksum. As a result, the checksum write may target freed memory or a stale stack copy rather than the live packet header. The TCP option bytes themselves are updated through skb->data, but the checksum update is performed through the invalidated header pointer, creating a memory-safety flaw and potentially emitting packets with a checksum that no longer matches the modified payload.
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A specific vulnerability affecting Red Hat Enterprise Linux 9 kernel-related packages, referenced in RHSA-2026:57252.
Linux kernel netfilter synproxy vulnerability involving TCP header handling after skb_ensure_writable.
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